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Answer Key: Review: Formulas and Mole Problems

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  1. A cation is a positively charged ion. An example is Ca+2.
  2. The nonmetals are located in the upper right hand area, above the stairstep.
  3. Fill in the chart.

    Symbol

    Name

    # of p+

    # of no

    # of e-

    atomic #

    atomic mass

    Al+3 aluminum ion 13 14 10 13 27
    O-2 oxide ion 8 8 10 8 16
    Co+2 cobalt (II) ion 27 32 25 27 59
    F-1 fluoride ion 9 10 10 9 19
    Hg mercury 80 121 80 80 201
  4. a) sodium sulfate   b) dinitrogen tetroxide   c) magnesium chloride   d) potassium dihydrogen phosphate  
    e) silicon tetrafluoride   f) nitrous acid   g) iron (III) nitrate   h) nitrogen dioxide   i) manganese (II) chromate  
    j) cobalt (II) phosphate
  5. a) H2CO3   b) Ba(ClO3)2   c) Sn3N4   d) HCl   e) CoH   f) NI3   g) SCl6   h) Ag2CO3
  6. Ionic: a,b,c,d,e,h molecular: f,g
  7. atom, molecule, formula unit
  8. Br2, I2, N2, Cl2, H2, O2, F2, At2
  9. answer to #9
  10. answer to #10
  11. answer to #11
  12. answer to #12
  13. answer to #13
  14. answer to #14
  15. answer to #15
  16. answer to #16
    so CuO has the highest %Cu (barely)
  17. answer to #17
  18. answer to #18
  19. f) 47.02 g/mole   g) 241.88 g/mol   h) 46.01 g/mol   i) 170.94 g/mol   j) 366.73 g/mol
  20. answer to #20
  21. answer to #21
  22. answer to #22

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